Why are rigid bodies not interacting?
I downloaded your file and tested couple things, and the problem seems to be the table having weird scale (5.483, 5.483, 0.369). By applying the scale (In object mode, select the table, hit Ctrl+A and select Scale) the physics start to work as expected in both files.  

I also noticed your some other issues with your table which might cause problems later (the board has at four meshes overlapping and the legs have inverted normals), but those are not in scope of this question.